Kill Reward: %-based VS last hit?

[Vaeria]

Im sure its happened to everyone at some point: You perfectly execute your jobs burst, getting someone down to 1-2% hp......then that (insert any job so im not guilty of picking on one in particular) that was playing it safe behind the line, contributing absolutely nothing, throws out 1 ranged attack and grabs the last hit, being awarded with the kill.

This wasn't as obvious in secure since the high/fever concept hadnt been preached yet, but from slaughter on, just became more and more evident. My question then: Would more people prefer to see kill reward/acknowledgement based on say greatest % done within 5-10 sec of death...or still just whoever got last hit?